06-18 02:34:53.941 15910-15910/com.example.carlos.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.carlos.myapplication, PID: 15910
java.lang.NullPointerException
at com.example.carlos.myapplication.MainActivity$1.onClick(MainActivity.java:40)
at android.view.View.performClick(View.java:4444)
at android.view.View$PerformClick.run(View.java:18440)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5014)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
at dalvik.system.NativeStart.main(Native Method)
分析Logcat有以下几步(程序停止运行):
过滤 AndroidRuntime tag ;
定位异常关键字 (java.lang.NullPointerException)
定位到具体代码(com.example.carlos.myapplication.MainActivity$1.onClick(MainActivity.java:40)
)
在你的 MainActivity.java 第40 行发生了空指针异常(程序调用了一个未初始化赋值的对象)
